From: Brian J. Tarricone <brian@xxxxxxxxxxxxx> Tested on MacBookAir3,1. Without this, we get EPROTO errors when fetching device config descriptors. Signed-off-by: Brian Tarricone <brian@xxxxxxxxxxxxx> Reported-by: Benoit Gschwind <gschwind@xxxxxxxxxxx> Tested-by: Edgar Hucek <gimli@xxxxxxxxxxxxxx> Cc: stable <stable@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx> --- drivers/usb/host/ehci-pci.c | 12 ++++++++++++ 1 files changed, 12 insertions(+), 0 deletions(-) diff --git a/drivers/usb/host/ehci-pci.c b/drivers/usb/host/ehci-pci.c index 01bb72b..655f3c9 100644 --- a/drivers/usb/host/ehci-pci.c +++ b/drivers/usb/host/ehci-pci.c @@ -161,6 +161,18 @@ static int ehci_pci_setup(struct usb_hcd *hcd) if (pdev->revision < 0xa4) ehci->no_selective_suspend = 1; break; + + /* MCP89 chips on the MacBookAir3,1 give EPROTO when + * fetching device descriptors unless LPM is disabled. + * There are also intermittent problems enumerating + * devices with PPCD enabled. + */ + case 0x0d9d: + ehci_info(ehci, "disable lpm/ppcd for nvidia mcp89"); + ehci->has_lpm = 0; + ehci->has_ppcd = 0; + ehci->command &= ~CMD_PPCEE; + break; } break; case PCI_VENDOR_ID_VIA: -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
